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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6a435f3cca6fde262a924e24e0dbaa0a1c0aeee15ff0719e1866bd2f53eb7b' 
  AND token = 'T6wW/5jsHsdYwLiq4B68TRerPg5Pxnj6Q1ftxyG67ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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