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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c83da2d2864270fa591448572142271cf5b9ea6e4850157cab4cb876a5c775f' 
  AND token = '3N29u8tt1I8IetbXKYJGG9XF7gwNeLnW5/uQaioSMDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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