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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a85d2274c676e381102e3b222c57d9ec6f54070af778a47572b741a6a90d499' 
  AND token = 'EWBdoz8p15QtHtd/JtPwRiPOeIj2cMtbyIh81+x1r20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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