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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47159c78c0f6313b6eb2600c628fa88b604bcff0b36d267a01d6eb181c175d50' 
  AND token = 'lYD1c0Q9m/Pj/6NRd9OcRMTqPSo9XXiGnZdJhOxZb60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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