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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826e525e3163a2edad9f68f53c79f45e96a26fbaa860e1eab5a8f0a28d794340' 
  AND token = 'mJs/aS2VciPi+hb3PS30pZgx+ZPEALiB/Uzx0i1rHPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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