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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6b165d4a1bb4820028e8125315ae8b51b866319f00f2fcab03e5cf5ff338e2' 
  AND token = 'QtdK5BfQnEpYHQu0pcc3qJDloUcdo7dkWwhtzYe8FUc=' 
  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"
    }
  }
}