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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca92440a6dc7884c411cdf3e19d5893e726b8aacbc37cba0004aafe066b8552' 
  AND token = 'N8RKOvX5Jr6yfCDxLCuu6SNs8kZ9lOFoZ7b3OWHbDxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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