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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da748d6e564e59e3acb3c0c08620bd370319894d3ad2e07c274303b08363120f' 
  AND token = 'Sj8f6xBiPi0JJ2OcMkjTcJKMYAZQoPWKlIekfmU8TvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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