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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3901f9fef133eede737c6cc91b916dabc8bfbb4f703f73d1876d166da75f3d1' 
  AND token = 'fWv0aC+szyOmN2lNEI3p2GxTJvjvwcvDIhzJk3c+Kmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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