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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251956f5ab3a06360b0a06e77377a5158a29190ad40814d549f60ead321ece47' 
  AND token = '1HO5lOzCJwtaXo5SLDpO1mFCK5Zt0eoN8i+fV29V4FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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