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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc35db886a47b2fc11fd1e39df9e4a9b5ce6f005dd19638e83847e9c650e7675' 
  AND token = 'jotZ0nCE7/P1LG9HeZoZwD4MFDTWHftFI+hRMm/xATM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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