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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8f1c16f70a27661340700ea608d27efb21231ee6ec10f726b43abc9a160c54' 
  AND token = 'QAvS+l3ppr8PjOaUJOoS91WwBdlSBtsN08BGjtWIWXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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