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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eb08b16e233190b21be3f1457adf9d3114764ed17a9e7f9c77454cae1e5715' 
  AND token = 'D+XkNuQ08saUGi3Vy0PE3H7tW+W66uAjqvE7bNNfKoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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