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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2188d5d2df41d6f674d64f7b94f914faea3693b476865d28bfe24124e7ab462c' 
  AND token = 'KSAf96UP9UKhK7Ryo64joJua0mDNCw6++alQgJbCf34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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