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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11bf8ea1271d44e1eb2bf5c3a0b0f77473780d5bff8b7f5541c22901bd6eac5f' 
  AND token = 'efNDL91HfLw7VYpTqTRlXIMvvmhWbe0EfmaKzYwQVZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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