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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0436e9d11a372214b19a3563584be73e8c3a5c32825a013fefae91a1fca2012e' 
  AND token = '822vl38o/XObEYmnoi65Jm4XeEBe+EMMRTj+LQknO6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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