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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14efd2231c68f1e2a402fadda165ee431789454cc641f8c7d9261730a0b996a7' 
  AND token = 'Oa2NRT+pjZSd3eE/0UmuqlJutizXlm1UDEO6u1/tRpU=' 
  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"
    }
  }
}