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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77939381928332303df801339eba25086af3f869dbff9cfc799886329c4bdb4f' 
  AND token = '4Q0ocqiUgk6mijI0yNPhCyGjwsgl4rqdASnxmFzI6jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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