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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eafb5d2b9bebe69aaf3e17eda0918e1ced22e5efec750deff8ba91f6d324dea' 
  AND token = 'K9gBqm8X8/o7WFKHHe3MYRue0wde5A8KlGs3FdbM9sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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