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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9728dda3d00424ef367a7f45f5a6edb919ed15819011768d2b952256ef55c174' 
  AND token = '3xzxUKI9xfMvOjSyxwucpB5x/ibUSl9DG8P8ch/ZZk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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