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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e3ee36ade1ea731351940a808082811a450d082df704b480a0c4c857cc1949' 
  AND token = 'SSlYtCu/6ib8xyRoBYQ3qUa3hQ1XtxnfeEN4jh6jlTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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