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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3497f2c35de67ed2e2a6fc5562b17e4ab14a3a78a190e58a69fd6a05ebd63842' 
  AND token = 'wKIa+GVEkKKkBzjDW9u6WO8LaUkVvOTjA2ZOh3dRh74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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