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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5540fffd88ac12623076e1cb84d34a2c9e1aef0fc9ff44d32d574f2df6831f' 
  AND token = 'vQ5fyW4kfQXDdcj2iLBOy3ZdQ6Tx9WpU3BR5VjNgikw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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