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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6506ff80243973cd9675dfd121f6f27c57f210c91826d24bf966c2425a85aab' 
  AND token = 'w30kxjPSoHWF94T2Zh2FB/hdVBAdI8oxDaya7kBnn+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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