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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7d75a3881e537f53ed0878d0a12670906e459830152f625fc0518243f25d63' 
  AND token = 'CsV+0yTYCiDBIh79bgf+gUXWIkNqNeVfsdz2y07Whec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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