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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786906caae190b9ca49cae7c41ef2f76fba5a777e384fc8ff4b9844fefecc3da' 
  AND token = 'tru1fElh2xs+qLiIvHpecrhmnEyrn3Gl9GhuSNbX/J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00148

JSON explain

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