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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc789141c82e8780debe599fb5fc1491f8ba0494e5347353c67f66f7f40c097' 
  AND token = 'oKYHn/VsKDvjDZN092VJ4uWVI1UEmt7WHHWt6KP6QMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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