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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e27a222326a789b5521d7b4334f7404456b78c06017342d063ad4ce62864d4d' 
  AND token = 'ih8Bu1uj3EfG7PZ07BaiBQOam8dt2+LSy1eIdt0/bQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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