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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac704496b79c3e293bdcfe9968d3821f91fce294d157ed02a2f6527d649712b' 
  AND token = 'v+9DB/9+I5BbM8w5nAr5whWbmEC1IHJr7Vk+FePbitk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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