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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c54110550026fe371f32579beaf7dd3dabf0853580ed0e3481a8921dbc4a689' 
  AND token = 'TXpb8AaKyyg4ejz94z8vnpdoC6tEnr8vC7sMsLMsGXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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