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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb36e0efced421e6324e71e2c01304ad96f267c4b6b7c04e55f0d5a1eb7db56' 
  AND token = 'nBGol2KhjqbjcjAmwsrpBfpIFXhZ2HTFhCMo+vbhiEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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