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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26dbd0dbf83313d6c4d17a4bcbd685f076256624a5b4ae1b99b39b15352c732' 
  AND token = 'L8r01027m+ZUnl1uly6kx76rr+2A4QuxE1ZRbsQ2zK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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