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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ae651fad7181fd4a337f3b2f013b597bb1ebfb12b9f09946ac30b40f95d968' 
  AND token = '1ce4zfDS6LQMhxYVvsd1f5ivlIt+jcSjDzJ4tentrM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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