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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8fc5268380e44be26d510b9252af38e50c749ec624a58a14f7e4ead8959f64' 
  AND token = 'eF7i1lSUtEaNWDHc5Qbmw1WnOxsXdmNNDBYgcyYeU/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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