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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa61bc6e37ab17d8b9a99be5856e1b3a9e48f7cb8c43805fe3b04f88ce582a9' 
  AND token = '2Nc5sZzXH3No7TII7+8eEGGpUXn7iL0p4V5O+x18HZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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