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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d47e9c519065f48f87a7cad726b34cdc9f6f8a5bafc4e957e92013c49e15e8' 
  AND token = 'raDabjA4cP+axGAxW7LhKreJhrH4Ank/B69ygAOSF68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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