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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d998e2596b68083a464cb38c03f2a735f72b4cb2a8ebd126386f5c56ca5ef3' 
  AND token = 'seZnf3a5sfO4lVpzOiAY4GGdbvQvLJ6ZaxjQ4sjAzU8=' 
  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"
    }
  }
}