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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42518856686e7c7fd31b862f5e388a632d6e3ef8f3367acb83884c6b03cad5bf' 
  AND token = '1MiNOW7wus2Ipmf/1oCMdMqwSL3J/UgD9huYBCazEmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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