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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f3aa63e88d609f369ab39b04b373ab178411a9aca2702be5df2811cc48c271' 
  AND token = 'w0ahAO7PIIATaZur0VQPhgu3DiDmOYAeteVqKlikN7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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