SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36ae070bc273fbdf815f7d18059d2ba376b3f01b9f6841c1c193d9bef8206d0' 
  AND token = 'wezqly5IJhyw1gmvFZU45dV7cuL+23fRahXW1JCsdBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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