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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df23393ebc55a5952a5ec5928a6a931049e4a9fd4a09c603f1c42949a6ae6a85' 
  AND token = 'xgrt6b/5GQQNC2CZbu9GJvZl3zAlRxsYedKuNl1RKG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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