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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798c8deb73667bdccd2bda8bdd7c49e0eaa87632300b2441ce3b7f960d3db689' 
  AND token = 'uW14VAdzXfWyGmsDlhzD5AGvKM0mP/wcCa2oYoTpjDs=' 
  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"
    }
  }
}