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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f49d1d5416f16cd1ca1f2d5dc821e82c759714e92b88b7542446bbb662364b' 
  AND token = 'LszC4OpwWaJyjaYHY/PPbKyIArJV9ekX0nId2Cok3LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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