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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb186ea411439c1a25ad0015899e429638977e5fff1641b885caa7813622e57' 
  AND token = 'H2fc6B9mAuE+XqQuwLL0CcEQyWmh9o7xEss6mTI26L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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