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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb6f1c24a2d86d9c8e1d8a152b04dfe7c9387ccb0b2e254e418a0b01721b5b9' 
  AND token = 'cLaWAeHib/EMIS3lHdDu12HDGgMsJWUA/J5/MGHcKRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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