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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5403b43b90651afa016f27dbdff20e443e9f7043118a315b70bf2084a7cdc40' 
  AND token = 'EDp9AI8j20gdy+F8U4+6c+IfH5W9BUX7kl8QHXXFQsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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