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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94935cbfc9158e009d1568558ba85a475e68ae5407219cf3c04da03294f44f2f' 
  AND token = 'vRS3WsB8RkN4Lu4JK95zSbcVnLwVAR6QX2mvdR6QMj0=' 
  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"
    }
  }
}