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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d10dbda434c2b85913b4c4328557fc448ad27d2c51e1e8ff9327df74afbfac6' 
  AND token = 'f6tGVEgpxlxqKF8nuM7FzSX9CT5Evw/0epNO/S1WHp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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