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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d81d3b4735ee620519aeb076ad8ffe6944ffa4912f7bcfb00f2000a0fe46bfa' 
  AND token = 'T77zvhbAXN+/7qzX70geN10ZCvIBm8iXnvfKjKT+Rq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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