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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5d296e6fd598d5c72b8c9ef7cfa8678e42e156eff22f14ea018e3364c8cbb1' 
  AND token = '9L2RVpsgzzkc/lBNASOFIKe4Rj0Duoi3buwHgdLZQr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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