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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07391f2e8b7aee22997bf25f5aadd7e07bd90498052f124333a92a3efc5a9e3c' 
  AND token = 'nyVmiWUbt6BAww4zp7bhb4XTOsJ9z0umkgg15pAx1Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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