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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2166ed1e67c10a3c4046dba447c0373de218c89fccd16579031595d338dea18d' 
  AND token = 'Y94ymuVtkW8S83NJgrE5AbC7bHORZtasp+E0r8LpeyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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