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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ec709c799cb501d5c2fe10b8bbefc5b76061ed0c32c9c93d0f8326a719621b' 
  AND token = 'asP515awPBt6mjJcBT9SYHvQq/X8nRNlsutw6LInPeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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