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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed80d19925e7edd55f84ea81b04214f796b45f48034ccbf180521eefda3704d' 
  AND token = 'YhNzTCmu59JsuT+Wwgi/AfbH0Sa3C9X2UNS/yWqV6wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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