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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ad0810b7daae13ec2494572e539def0c1c7c29ce8d377671a851ee7faa171f' 
  AND token = '0opPvLU0CG0dKnBjwrETUW08jFSAVRpJcsIjIe1h+vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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