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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3937254f825e9b2d26f27bc478d10797b8c2d72340aa4d9916a11a84016701' 
  AND token = 'nEK9F778OkEseudBSbJKwyhnfx6YfkDS2hrBXGgPwvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00169

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}