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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5e03802d39e064d8a10f87402177874d603b09439227b52648f5919378dbbe' 
  AND token = 'ex+TBrOQOu9jBtfVLh5pZnN9qFET4Y5rhATrYb35D7M=' 
  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"
    }
  }
}