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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb200f6ccda64921f4730253cd57afb693ec4e35258b57fa37e139157bf96f1d' 
  AND token = 'tOC6REpzL7aNY2rSjTUc9+Nq8WdyUN/oVzKfIH3sb1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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