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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06d7d8b652d4df06502f17a805f0114dd4fd23c0042ae6b9cbb53ba1448b4a3' 
  AND token = 'b5nJUi1kSt3RPN6JK1BNUhDBz4F/f5IjbPYgUBO+wR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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