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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829b0e43ad68e7f1cf9fbcd79ab4967654f43fad6a02583efeb847d0b9c7a477' 
  AND token = 'vkYu6E0YLbP0Pt9uM7rKWnFyGz4HyXbCviyLkJl6g78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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