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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25850bfddf031e4877f8bc2a8f025b07c5ad61780a43154f64f9044acc36797f' 
  AND token = 'FybsL338gxQPxHH6TXLV4RiEAxtxH69KGmy5dBFpO8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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